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From: "zamazan4ik at tut dot by" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/114851] New: Alternative to -Wmisexpect from LLVM
 in GCC
Date: Thu, 25 Apr 2024 09:59:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114851

            Bug ID: 114851
           Summary: Alternative to -Wmisexpect from LLVM in GCC
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zamazan4ik at tut dot by
  Target Milestone: ---

LLVM infrastructure supports a diagnostic for checking mismatches between
user-provided __builtin_expect/[[likely]] hints and PGO profiles:
https://clang.llvm.org/docs/DiagnosticsReference.html#wmisexpect +
https://llvm.org/docs/MisExpect.html (and an example of its usage in Chromi=
um:
https://issues.chromium.org/issues/40694104).

I was trying to find a similar diagnostic in GCC but found nothing. Is there
anything similar in GCC? If not, can we make the issue a Feature Request for
such a feature? Having such a diagnostic can be helpful in practice since it
allows for finding wrongfully placed user hints in sources.=